#!/usr/bin/env python3
import hashlib
import json
import os
import pathlib
import sys
import tempfile

import bpy


def report_scene():
    scene = bpy.context.scene
    cube = bpy.data.objects.get("WBV2P2004ViewportCube")
    camera = bpy.data.objects.get("WBV2P2004ViewportCamera")
    if cube is None or cube.type != "MESH" or camera is None or camera.type != "CAMERA":
        raise RuntimeError("VIEWPORT_INVALID: viewport fixture is missing cube or camera")
    return {
        "sceneId": "scene:" + scene.name,
        "cubeId": "object:" + cube.name,
        "meshId": "mesh:" + cube.data.name,
        "cameraId": "object:" + camera.name,
        "cameraDataId": "camera:" + camera.data.name,
        "cubeLocation": [round(float(value), 6) for value in cube.location],
        "cameraLocation": [round(float(value), 6) for value in camera.location],
        "cameraLensMm": round(float(camera.data.lens), 6),
        "vertexCount": len(cube.data.vertices),
        "faceCount": len(cube.data.polygons),
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-wbv2-p2-004-desktop.py -- FIXTURE REPORT")
    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=True)
    before = report_scene()
    descriptor, temporary = tempfile.mkstemp(prefix="wbv2-p2-004-reopen-", suffix=".blend", dir=fixture.parent)
    os.close(descriptor)
    try:
        bpy.ops.wm.save_as_mainfile(filepath=temporary, check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=temporary, load_ui=True)
        after = report_scene()
    finally:
        pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after:
        raise RuntimeError(f"VIEWPORT_INVALID: desktop save/reopen drift: {before} != {after}")
    value = {
        "schemaVersion": 1,
        "task": "WBV2-P2-004",
        "operation": "VIEWPORT_MAIN_OFFSCREEN_DESKTOP",
        "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(),
        "scene": after,
        "saveReopen": "EXACT",
        "blenderVersion": bpy.app.version_string,
    }
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(json.dumps(value, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print("wbv2-p2-004-desktop-ok cube=%s camera=%s pixels=browser saveReopen=exact" % (after["cubeId"], after["cameraId"]))


if __name__ == "__main__":
    main()